Abstract:Rust preventive oil (RPO) provides temporary protection to steel during storage and transit. Premature failure occurs as surface defects due to inefficient RPO quality. Conventional corrosion tests like salt spray and cyclic corrosion provide minimum information about corrosion mechanism. We applied separately three RPO, named here as A-C, on bearing steels and their corrosion performance was examined by scanning Kelvin probe (SKP). The corrosion potential of samples lowered after oil application. It seems tha… Show more
“…Literature suggests that the higher Volta potential of the cleaned surface than the oiled surface indicates that the oil is adsorbed on the metal surfaces by either ionic or covalent bonds. It indicates that the steel surface act as Lewis acid, whereas oil behaves as a Lewis base by donating electrons to the steel surface bonds [15,21].…”
Section: Resultsmentioning
confidence: 99%
“…Literature suggests that the higher Volta potential of the cleaned surface than the oiled surface indicates that the oil is adsorbed on the metal surfaces by either ionic or covalent bonds. It indicates that the steel surface act as Lewis acid, whereas oil behaves as a Lewis base by donating electrons to the steel surface bonds [15,21]. Figure 5 Schematic view of set-up made for Kelvin probe study at the cleaned-oiled interface. Figure 6 SKP study of laboratory cleaned samples at cleaned-oil interface area.…”
Section: Resultsmentioning
confidence: 99%
“…It is an advantageous technique to examine the oxidation behaviour of metal surfaces and corrosion of organic coated substrates [10][11][12][13]. However, there is limited literature published on its usage on oiled steel surface [14,15].…”
Oils and iron fines deposit on carbon steel during cold rolling and are removed by an electrolytic cleaning line (ECL). Sometimes localized contamination is observed on the ECL samples. No reliable tests are available for on-line measurement and the off-line tests demand samples with a large surface area. SKP addresses this issue effectively. SKP shows ∼390 mV potential difference between the clean and the uncleaned surface, with the cleaned surface potential being more positive. This indicates that the oil on the steel acts as a Lewis base, whereas the steel surface acts as a Lewis acid. Hence, the potential of the sample increases after cleaning. FTIR confirmed the absence of oil peaks on the cleaned samples. Deposition of an optimum thickness of the silicate layer is another important aspect of the ECL. It was measured by AES which displayed 2.3 nm of the silicate layer deposited on the cleaned steel surface.
“…Literature suggests that the higher Volta potential of the cleaned surface than the oiled surface indicates that the oil is adsorbed on the metal surfaces by either ionic or covalent bonds. It indicates that the steel surface act as Lewis acid, whereas oil behaves as a Lewis base by donating electrons to the steel surface bonds [15,21].…”
Section: Resultsmentioning
confidence: 99%
“…Literature suggests that the higher Volta potential of the cleaned surface than the oiled surface indicates that the oil is adsorbed on the metal surfaces by either ionic or covalent bonds. It indicates that the steel surface act as Lewis acid, whereas oil behaves as a Lewis base by donating electrons to the steel surface bonds [15,21]. Figure 5 Schematic view of set-up made for Kelvin probe study at the cleaned-oiled interface. Figure 6 SKP study of laboratory cleaned samples at cleaned-oil interface area.…”
Section: Resultsmentioning
confidence: 99%
“…It is an advantageous technique to examine the oxidation behaviour of metal surfaces and corrosion of organic coated substrates [10][11][12][13]. However, there is limited literature published on its usage on oiled steel surface [14,15].…”
Oils and iron fines deposit on carbon steel during cold rolling and are removed by an electrolytic cleaning line (ECL). Sometimes localized contamination is observed on the ECL samples. No reliable tests are available for on-line measurement and the off-line tests demand samples with a large surface area. SKP addresses this issue effectively. SKP shows ∼390 mV potential difference between the clean and the uncleaned surface, with the cleaned surface potential being more positive. This indicates that the oil on the steel acts as a Lewis base, whereas the steel surface acts as a Lewis acid. Hence, the potential of the sample increases after cleaning. FTIR confirmed the absence of oil peaks on the cleaned samples. Deposition of an optimum thickness of the silicate layer is another important aspect of the ECL. It was measured by AES which displayed 2.3 nm of the silicate layer deposited on the cleaned steel surface.
Skin pass rolling is considered as the final forming stage in cold‐rolled close annealed steel. Surface properties and flatness are the key attributes for automotive customers. Efficient skin pass rolling overcomes surface defects that lead to material rejection. This study portrays a brown stain defect with higher defect severity. The brown stain defect is observed in a few coils that are processed through alkaline electrocleaning (ECL). Coils bypassing ECL do not show such defect. Defect characterization through scanning electron microscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy shows initiation of oxidation of steel substrate. The presence of skin pass fluid residues in the defected area is the root cause for the stain formation. Techniques such as glow discharge optical emission spectroscopy, Kelvin probe, Raman spectroscopy, and electrochemical tests emphasize the role of final electrode polarity in ECL with the nature of passive oxide film formed when skin pass fluid is applied on the steel surface. This study reveals that skin pass fluid applied on anodically cleaned coils provides a uniform passive surface that restricts the defect formation.
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